Square attachment for saws



Oct. 20, 1925.

H. E. M KlNGA SQUARE AT'rAdnmsm FOR sAws Filed April 24, 1924 latented Oct. 20, 1925.

UNITED STATES tssaaea PATENT OFFICE.

SQUARE ATTACHMENT FOR SAWS.

Application filed April 24, 1924. Serial No. 708,660.

To all whom it may concern:

'Be it known that I, HARRY E. MAGKINGA, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Square Attachments for Saws, of which the following is a specification.

This invention is a square attachment for saws.

An object is to make a device which is readily applied to and clamped upon a straight back hand saw to make a square at right angles to the edge of the straight back and at another angle, preferably 45 or 30 or 60 degrees.

Other objects and advantages will appear from the drawings and specification.

The drawings illustrate the square attachment for saws and its use with relation to a hand saw having a straight back.

Figure 1 is a perspective of a square attachment for saws embodying the principles of my invention, parts being broken away 2 and shown in section.

Fig. 2 is a diagrammatic view showing the attachment upon a hand saw having a straight back edge to form a square and showing the square in use to lay off an angle of 45 degrees on a piece of work.

Fig. 3 is a View analogous to Fig. 2 and shows the square in use for laying off right angles.

The details of the attachment for saws and its use shown in the drawings are as follows:

The attachment is preferably a single integral body 1 having a flat straight face forming a straight edge 2 and having a slot 3 dividing the body into two arms 4 and 5, the slot extending longitudinally of the straight edge 2 and dividing the straight edge into two equal parts, and the slot 3 terminating at a shoulder 6, said shoulder 6 extending in a plane crosswise of the straight edge 2 at one end of the straight edge and at right angles to the straight edge.

The solid head 7 at the opposite side of the shoulder 6 from the slot 3 has a second straight edge 8 extending from the end of the straight edge 2 in the plane of the end I of the shoulder 6 where the plane of the shoulder 6 crosses the plane of the straight edge 2. The angle of the second straight edge 8 relative to the straight edge 2 is shown to be 45 degrees. Obviously it might be 30 or degrees, or any other desired angle.

An opening 9 is formedthrough the arms 60 4 and 5 just in front of the shoulder 6 and substantially at the transverse center of the shoulder to release dirt, metal chips, or the I like, from in front of the shoulder 6. Set screws 10 and 11 are tapped through the o5 arm 4 and preferably have recessed, kerfed heads normally substantially flush with the outer face of the arm 4.

The attachment thus constructed is placed with the straight edge 12 of the hand saw fitting against the shoulder 6 and the set screws 10 and 11 are tightened to hold the attachment rigidly in place. When so mounted, the straight edge 2 is upon both sides of the saw blade and at right angles to the straight edge 12 of the saw, and the second straight edge 8 is at a different angle, preferably 45 degrees as shown. When the square thus produced is placed upon a board 13 with the second straight edge 8 against the edge of the board, the straight edge 12 of the saw extends across the board 13 at an angle of 45 degrees. When the saw blade is placed against a board 14 with the straight edge 2 against the edge of the board, the straight edge 12 is at right angles to the edge of the board.

Various changes may be made without departing from thespirit of the invention as claimed.

I claim:

A square attachment for saws consisting of an integral body having a straight edge and a slot with a shoulder adapted to engage the back of a saw, the body having a 95 second straight edge forming an angle with the shoulder.

In testimony whereof I have signed my name to this specification.

HARRY E. MAOKINGA. 

